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| Pardo Villavece, Natalia, Jaramillo, José María and Cepeda, Héctor THE PAIPA VOLCANO, EASTERN CORDILLERA OF COLOMBIA , SOUTH AMERICA (PART II): PETROGRAPHY AND MAJOR ELEMENTS PETROLOGY . Earth Sci. Res. J., Dec 2005, vol.9, no.2, p.148-164. ISSN 1794-6190
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